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Pokemon Red and Blue Seafoam Islands and Cinnabar Route Walkthrough

Volcano Badge

Seafoam Islands and Cinnabar Route section for the Pokemon Red and Blue walkthrough with wild Pokemon, trainers, items, hidden items, coordinates, and boss strategy.

By Damodar Sharma Updated June 19, 2026 Walkthrough

Surf through the south sea route, solve Seafoam's boulder-current puzzle, and optionally catch Articuno. This page is a standalone section for Phase 7: Volcano Badge, with source-backed Red/Blue encounter, trainer, item, hidden item, and boss data.

Source maps

Route 19, Route 20, Seafoam Islands 1F, Seafoam Islands B1F, Seafoam Islands B2F, Seafoam Islands B3F, Seafoam Islands B4F, and Cinnabar Island.

Wild rows94 Trainers20 Items3

Route plan

You can also Surf south from Pallet via Route 21, but Seafoam is core completion content and has Articuno.

Wild Pokemon

Area / subarea Version Method Pokemon Level Odds Condition / requirement
Seafoam Islands 1FBothTall grass / cave floor Seel Red and Blue sprite Seel 3020%Encounter rate 15; no time-of-day split in Red/Blue.
Seafoam Islands 1FRedTall grass / cave floor Slowpoke Red and Blue sprite Slowpoke 3020%Encounter rate 15; no time-of-day split in Red/Blue.
Seafoam Islands 1FRedTall grass / cave floor Shellder Red and Blue sprite Shellder 28-3020%Encounter rate 15; no time-of-day split in Red/Blue.
Seafoam Islands 1FRedTall grass / cave floor Horsea Red and Blue sprite Horsea 28-3020%Encounter rate 15; no time-of-day split in Red/Blue.
Seafoam Islands 1FBothTall grass / cave floor Zubat Red and Blue sprite Zubat 219.8%Encounter rate 15; no time-of-day split in Red/Blue.
Seafoam Islands 1FBothTall grass / cave floor Golbat Red and Blue sprite Golbat 295.1%Encounter rate 15; no time-of-day split in Red/Blue.
Seafoam Islands 1FRedTall grass / cave floor Psyduck Red and Blue sprite Psyduck 285.1%Encounter rate 15; no time-of-day split in Red/Blue.
Seafoam Islands 1FRedTall grass / cave floor Golduck Red and Blue sprite Golduck 381.2%Encounter rate 15; no time-of-day split in Red/Blue.
Seafoam Islands 1FBlueTall grass / cave floor Psyduck Red and Blue sprite Psyduck 3020%Encounter rate 15; no time-of-day split in Red/Blue.
Seafoam Islands 1FBlueTall grass / cave floor Staryu Red and Blue sprite Staryu 28-3020%Encounter rate 15; no time-of-day split in Red/Blue.
Seafoam Islands 1FBlueTall grass / cave floor Krabby Red and Blue sprite Krabby 28-3020%Encounter rate 15; no time-of-day split in Red/Blue.
Seafoam Islands 1FBlueTall grass / cave floor Slowpoke Red and Blue sprite Slowpoke 285.1%Encounter rate 15; no time-of-day split in Red/Blue.
Seafoam Islands 1FBlueTall grass / cave floor Slowbro Red and Blue sprite Slowbro 381.2%Encounter rate 15; no time-of-day split in Red/Blue.
Seafoam Islands B1FRedTall grass / cave floor Staryu Red and Blue sprite Staryu 3020%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B1FRedTall grass / cave floor Horsea Red and Blue sprite Horsea 30-3230%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B1FRedTall grass / cave floor Shellder Red and Blue sprite Shellder 3215%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B1FRedTall grass / cave floor Slowpoke Red and Blue sprite Slowpoke 28-3015%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B1FBothTall grass / cave floor Seel Red and Blue sprite Seel 28-3015%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B1FBothTall grass / cave floor Dewgong Red and Blue sprite Dewgong 384.3%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B1FRedTall grass / cave floor Seadra Red and Blue sprite Seadra 371.2%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B1FBlueTall grass / cave floor Shellder Red and Blue sprite Shellder 3020%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B1FBlueTall grass / cave floor Krabby Red and Blue sprite Krabby 30-3230%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B1FBlueTall grass / cave floor Staryu Red and Blue sprite Staryu 3215%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B1FBlueTall grass / cave floor Psyduck Red and Blue sprite Psyduck 28-3015%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B1FBlueTall grass / cave floor Kingler Red and Blue sprite Kingler 371.2%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B2FBothTall grass / cave floor Seel Red and Blue sprite Seel 30-3235%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B2FRedTall grass / cave floor Slowpoke Red and Blue sprite Slowpoke 30-3230%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B2FRedTall grass / cave floor Horsea Red and Blue sprite Horsea 28-3015%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B2FRedTall grass / cave floor Staryu Red and Blue sprite Staryu 309.8%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B2FRedTall grass / cave floor Shellder Red and Blue sprite Shellder 285.1%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B2FBothTall grass / cave floor Golbat Red and Blue sprite Golbat 304.3%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B2FRedTall grass / cave floor Slowbro Red and Blue sprite Slowbro 371.2%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B2FBlueTall grass / cave floor Psyduck Red and Blue sprite Psyduck 30-3230%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B2FBlueTall grass / cave floor Krabby Red and Blue sprite Krabby 28-3015%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B2FBlueTall grass / cave floor Shellder Red and Blue sprite Shellder 309.8%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B2FBlueTall grass / cave floor Staryu Red and Blue sprite Staryu 285.1%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B2FBlueTall grass / cave floor Golduck Red and Blue sprite Golduck 371.2%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B3FRedTall grass / cave floor Slowpoke Red and Blue sprite Slowpoke 31-3335%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B3FBothTall grass / cave floor Seel Red and Blue sprite Seel 31-3330%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B3FRedTall grass / cave floor Horsea Red and Blue sprite Horsea 29-3115%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B3FRedTall grass / cave floor Shellder Red and Blue sprite Shellder 29-3115%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B3FRedTall grass / cave floor Seadra Red and Blue sprite Seadra 394.3%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B3FBothTall grass / cave floor Dewgong Red and Blue sprite Dewgong 371.2%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B3FBlueTall grass / cave floor Psyduck Red and Blue sprite Psyduck 31-3335%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B3FBlueTall grass / cave floor Krabby Red and Blue sprite Krabby 29-3115%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B3FBlueTall grass / cave floor Staryu Red and Blue sprite Staryu 29-3115%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B3FBlueTall grass / cave floor Kingler Red and Blue sprite Kingler 394.3%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B4FRedTall grass / cave floor Horsea Red and Blue sprite Horsea 31-3335%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B4FRedTall grass / cave floor Shellder Red and Blue sprite Shellder 31-3330%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B4FRedTall grass / cave floor Slowpoke Red and Blue sprite Slowpoke 29-3115%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B4FBothTall grass / cave floor Seel Red and Blue sprite Seel 29-3115%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B4FRedTall grass / cave floor Slowbro Red and Blue sprite Slowbro 394.3%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B4FBothTall grass / cave floor Golbat Red and Blue sprite Golbat 321.2%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B4FBlueTall grass / cave floor Krabby Red and Blue sprite Krabby 31-3335%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B4FBlueTall grass / cave floor Staryu Red and Blue sprite Staryu 31-3330%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B4FBlueTall grass / cave floor Psyduck Red and Blue sprite Psyduck 29-3115%Encounter rate 10; no time-of-day split in Red/Blue.
Seafoam Islands B4FBlueTall grass / cave floor Golduck Red and Blue sprite Golduck 394.3%Encounter rate 10; no time-of-day split in Red/Blue.
Route 19BothOld Rod Magikarp Red and Blue sprite Magikarp 5100%Any fishable water tile.
Route 19BothGood Rod Goldeen Red and Blue sprite Goldeen 1050%Any fishable water tile after getting Good Rod.
Route 19BothGood Rod Poliwag Red and Blue sprite Poliwag 1050%Any fishable water tile after getting Good Rod.
Route 19BothSuper Rod Staryu Red and Blue sprite Staryu 1525%Super Rod group 8.
Route 19BothSuper Rod Horsea Red and Blue sprite Horsea 1525%Super Rod group 8.
Route 19BothSuper Rod Shellder Red and Blue sprite Shellder 1525%Super Rod group 8.
Route 19BothSuper Rod Goldeen Red and Blue sprite Goldeen 1525%Super Rod group 8.
Route 20BothOld Rod Magikarp Red and Blue sprite Magikarp 5100%Any fishable water tile.
Route 20BothGood Rod Goldeen Red and Blue sprite Goldeen 1050%Any fishable water tile after getting Good Rod.
Route 20BothGood Rod Poliwag Red and Blue sprite Poliwag 1050%Any fishable water tile after getting Good Rod.
Route 20BothSuper Rod Staryu Red and Blue sprite Staryu 1525%Super Rod group 8.
Route 20BothSuper Rod Horsea Red and Blue sprite Horsea 1525%Super Rod group 8.
Route 20BothSuper Rod Shellder Red and Blue sprite Shellder 1525%Super Rod group 8.
Route 20BothSuper Rod Goldeen Red and Blue sprite Goldeen 1525%Super Rod group 8.
Seafoam Islands B3FBothOld Rod Magikarp Red and Blue sprite Magikarp 5100%Any fishable water tile.
Seafoam Islands B3FBothGood Rod Goldeen Red and Blue sprite Goldeen 1050%Any fishable water tile after getting Good Rod.
Seafoam Islands B3FBothGood Rod Poliwag Red and Blue sprite Poliwag 1050%Any fishable water tile after getting Good Rod.
Seafoam Islands B3FBothSuper Rod Staryu Red and Blue sprite Staryu 1525%Super Rod group 8.
Seafoam Islands B3FBothSuper Rod Horsea Red and Blue sprite Horsea 1525%Super Rod group 8.
Seafoam Islands B3FBothSuper Rod Shellder Red and Blue sprite Shellder 1525%Super Rod group 8.
Seafoam Islands B3FBothSuper Rod Goldeen Red and Blue sprite Goldeen 1525%Super Rod group 8.
Seafoam Islands B4FBothOld Rod Magikarp Red and Blue sprite Magikarp 5100%Any fishable water tile.
Seafoam Islands B4FBothGood Rod Goldeen Red and Blue sprite Goldeen 1050%Any fishable water tile after getting Good Rod.
Seafoam Islands B4FBothGood Rod Poliwag Red and Blue sprite Poliwag 1050%Any fishable water tile after getting Good Rod.
Seafoam Islands B4FBothSuper Rod Staryu Red and Blue sprite Staryu 1525%Super Rod group 8.
Seafoam Islands B4FBothSuper Rod Horsea Red and Blue sprite Horsea 1525%Super Rod group 8.
Seafoam Islands B4FBothSuper Rod Shellder Red and Blue sprite Shellder 1525%Super Rod group 8.
Seafoam Islands B4FBothSuper Rod Goldeen Red and Blue sprite Goldeen 1525%Super Rod group 8.
Cinnabar IslandBothOld Rod Magikarp Red and Blue sprite Magikarp 5100%Any fishable water tile.
Cinnabar IslandBothGood Rod Goldeen Red and Blue sprite Goldeen 1050%Any fishable water tile after getting Good Rod.
Cinnabar IslandBothGood Rod Poliwag Red and Blue sprite Poliwag 1050%Any fishable water tile after getting Good Rod.
Cinnabar IslandBothSuper Rod Staryu Red and Blue sprite Staryu 1525%Super Rod group 8.
Cinnabar IslandBothSuper Rod Horsea Red and Blue sprite Horsea 1525%Super Rod group 8.
Cinnabar IslandBothSuper Rod Shellder Red and Blue sprite Shellder 1525%Super Rod group 8.
Cinnabar IslandBothSuper Rod Goldeen Red and Blue sprite Goldeen 1525%Super Rod group 8.
Seafoam Islands B4FBothStatic Pokemon Articuno Red and Blue sprite Articuno 50StaticInteract with the overworld Pokemon.
Seafoam Islands B4FBothStatic legendary Articuno Red and Blue sprite Articuno 50StaticPush boulders to stop the current, then reach Articuno on B4F.

Trainers

Route order Trainer Team Reward Optional / rematch note
1. Route 19 (8, 7)Swimmer trainer spriteSwimmerParty #2
Tentacool Red and Blue sprite Tentacool Lv. 30 Shellder Red and Blue sprite Shellder Lv. 30
$150One-time trainer; no rematch in Red/Blue.
2. Route 19 (13, 7)Swimmer trainer spriteSwimmerParty #3
Goldeen Red and Blue sprite Goldeen Lv. 29 Horsea Red and Blue sprite Horsea Lv. 29 Staryu Red and Blue sprite Staryu Lv. 29
$145One-time trainer; no rematch in Red/Blue.
3. Route 19 (13, 25)Swimmer trainer spriteSwimmerParty #4
Poliwag Red and Blue sprite Poliwag Lv. 30 Poliwhirl Red and Blue sprite Poliwhirl Lv. 30
$150One-time trainer; no rematch in Red/Blue.
4. Route 19 (4, 27)Swimmer trainer spriteSwimmerParty #5
Horsea Red and Blue sprite Horsea Lv. 27 Tentacool Red and Blue sprite Tentacool Lv. 27 Tentacool Red and Blue sprite Tentacool Lv. 27 Goldeen Red and Blue sprite Goldeen Lv. 27
$135One-time trainer; no rematch in Red/Blue.
5. Route 19 (16, 31)Swimmer trainer spriteSwimmerParty #6
Goldeen Red and Blue sprite Goldeen Lv. 29 Shellder Red and Blue sprite Shellder Lv. 29 Seaking Red and Blue sprite Seaking Lv. 29
$145One-time trainer; no rematch in Red/Blue.
6. Route 19 (9, 11)Swimmer trainer spriteSwimmerParty #7
Horsea Red and Blue sprite Horsea Lv. 30 Horsea Red and Blue sprite Horsea Lv. 30
$150One-time trainer; no rematch in Red/Blue.
7. Route 19 (8, 43)Beauty trainer spriteBeautyParty #12
Poliwag Red and Blue sprite Poliwag Lv. 27 Goldeen Red and Blue sprite Goldeen Lv. 27 Seaking Red and Blue sprite Seaking Lv. 27 Goldeen Red and Blue sprite Goldeen Lv. 27 Poliwag Red and Blue sprite Poliwag Lv. 27
$1,890One-time trainer; no rematch in Red/Blue.
8. Route 19 (11, 43)Beauty trainer spriteBeautyParty #13
Goldeen Red and Blue sprite Goldeen Lv. 30 Seaking Red and Blue sprite Seaking Lv. 30
$2,100One-time trainer; no rematch in Red/Blue.
9. Route 19 (9, 42)Swimmer trainer spriteSwimmerParty #8
Tentacool Red and Blue sprite Tentacool Lv. 27 Tentacool Red and Blue sprite Tentacool Lv. 27 Staryu Red and Blue sprite Staryu Lv. 27 Horsea Red and Blue sprite Horsea Lv. 27 Tentacruel Red and Blue sprite Tentacruel Lv. 27
$135One-time trainer; no rematch in Red/Blue.
10. Route 19 (10, 44)Beauty trainer spriteBeautyParty #14
Staryu Red and Blue sprite Staryu Lv. 29 Staryu Red and Blue sprite Staryu Lv. 29 Staryu Red and Blue sprite Staryu Lv. 29
$2,030One-time trainer; no rematch in Red/Blue.
11. Route 20 (87, 8)Swimmer trainer spriteSwimmerParty #9
Shellder Red and Blue sprite Shellder Lv. 31 Cloyster Red and Blue sprite Cloyster Lv. 31
$155One-time trainer; no rematch in Red/Blue.
12. Route 20 (68, 11)Beauty trainer spriteBeautyParty #15
Seadra Red and Blue sprite Seadra Lv. 30 Horsea Red and Blue sprite Horsea Lv. 30 Seadra Red and Blue sprite Seadra Lv. 30
$2,100One-time trainer; no rematch in Red/Blue.
13. Route 20 (45, 10)Beauty trainer spriteBeautyParty #6
Seaking Red and Blue sprite Seaking Lv. 35
$2,450One-time trainer; no rematch in Red/Blue.
14. Route 20 (55, 14)Jr. Trainer F trainer spriteJr. Trainer FParty #24
Tentacool Red and Blue sprite Tentacool Lv. 30 Horsea Red and Blue sprite Horsea Lv. 30 Seel Red and Blue sprite Seel Lv. 30
$600One-time trainer; no rematch in Red/Blue.
15. Route 20 (38, 13)Swimmer trainer spriteSwimmerParty #10
Staryu Red and Blue sprite Staryu Lv. 35
$175One-time trainer; no rematch in Red/Blue.
16. Route 20 (87, 13)Swimmer trainer spriteSwimmerParty #11
Horsea Red and Blue sprite Horsea Lv. 28 Horsea Red and Blue sprite Horsea Lv. 28 Seadra Red and Blue sprite Seadra Lv. 28 Horsea Red and Blue sprite Horsea Lv. 28
$140One-time trainer; no rematch in Red/Blue.
17. Route 20 (34, 9)Bird Keeper trainer spriteBird KeeperParty #11
Fearow Red and Blue sprite Fearow Lv. 30 Fearow Red and Blue sprite Fearow Lv. 30 Pidgeotto Red and Blue sprite Pidgeotto Lv. 30
$750One-time trainer; no rematch in Red/Blue.
18. Route 20 (25, 7)Beauty trainer spriteBeautyParty #7
Shellder Red and Blue sprite Shellder Lv. 30 Shellder Red and Blue sprite Shellder Lv. 30 Cloyster Red and Blue sprite Cloyster Lv. 30
$2,100One-time trainer; no rematch in Red/Blue.
19. Route 20 (24, 12)Jr. Trainer F trainer spriteJr. Trainer FParty #16
Goldeen Red and Blue sprite Goldeen Lv. 31 Seaking Red and Blue sprite Seaking Lv. 31
$620One-time trainer; no rematch in Red/Blue.
20. Route 20 (15, 8)Beauty trainer spriteBeautyParty #8
Poliwag Red and Blue sprite Poliwag Lv. 31 Seaking Red and Blue sprite Seaking Lv. 31
$2,170One-time trainer; no rematch in Red/Blue.

Items And Hidden Items

Item Type Area / direction Coordinate Requirement
NuggetHidden itemHidden on the searchable tile at (15, 15) in Seafoam Islands B2F.(15, 15)Press A on the hidden tile or use the Itemfinder nearby.
Max ElixerHidden itemHidden on the searchable tile at (9, 16) in Seafoam Islands B3F.(9, 16)Press A on the hidden tile or use the Itemfinder nearby.
Ultra BallHidden itemHidden on the searchable tile at (25, 17) in Seafoam Islands B4F.(25, 17)Press A on the hidden tile or use the Itemfinder nearby.

Boss Strategy

No boss or Rival branch is attached to this section.

Completion Checklist

  • Push boulders to control currents.
  • Catch Articuno if desired.
  • Reach Cinnabar Island.
  • Verify the wild table's version splits before leaving if you are filling the Pokedex.
  • Use the item rows as a visible-item and hidden-item sweep before moving to the next section.

Sources

  • pret/pokered: wild encounters, trainer parties, trainer money, map object events, hidden event items, rods, trades, and prize Pokemon.
  • Encounter odds aggregate the Gen I ten-slot rates: 51/256, 51/256, 39/256, 25/256, 25/256, 25/256, 13/256, 13/256, 11/256, and 3/256.
  • Red/Blue has no day/night encounter column; tables use Version, Method, and Condition instead.

Related articles

Pokemon Red and Blue Walkthrough HubPhase 7: Volcano BadgePrevious: Routes 16-18 and Cycling RoadNext: Cinnabar Island and Pokemon Mansion